//
//  SceneDelegate.swift
//  WeiboDemo
//
//  Created by Quentin Zang on 2020/3/12.
//  Copyright © 2020 臧乾坤. All rights reserved.
//

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?


    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
        guard let windowScene = (scene as? UIWindowScene) else { return }
        //在这里手动创建新的window
        window = UIWindow()
        window?.windowScene = windowScene
        //let navi = UINavigationController(rootViewController: ViewController())
        window?.backgroundColor = .white
        window?.rootViewController = WelcomeViewController()
        window?.makeKeyAndVisible()
        NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: WBSwitchRootViewControllerNotification), // 通知名字
                                               object: nil, // 发送通知的对象如果为nil,监听任何对象
                                               queue: nil) // nil代表主线程
        { [weak self](notification) in
            print(Thread.current)
            print(notification)
            self?.window?.rootViewController = MainViewController()
        }
        //print(isNewVersion)
    }
    deinit {
        // 注销通知
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: WBSwitchRootViewControllerNotification), object: nil)
    }

    func sceneDidDisconnect(_ scene: UIScene) {
        // Called as the scene is being released by the system.
        // This occurs shortly after the scene enters the background, or when its session is discarded.
        // Release any resources associated with this scene that can be re-created the next time the scene connects.
        // The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
    }

    func sceneDidBecomeActive(_ scene: UIScene) {
        // Called when the scene has moved from an inactive state to an active state.
        // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
    }

    func sceneWillResignActive(_ scene: UIScene) {
        // Called when the scene will move from an active state to an inactive state.
        // This may occur due to temporary interruptions (ex. an incoming phone call).
    }

    func sceneWillEnterForeground(_ scene: UIScene) {
        // Called as the scene transitions from the background to the foreground.
        // Use this method to undo the changes made on entering the background.
    }

    func sceneDidEnterBackground(_ scene: UIScene) {
        // Called as the scene transitions from the foreground to the background.
        // Use this method to save data, release shared resources, and store enough scene-specific state information
        // to restore the scene back to its current state.
    }


}

// MARK: - 界面切换代码
extension SceneDelegate {
    
    /// 启动的根视图控制器
    private var DefaultRootViewController: UIViewController {
        
        return MainViewController()
    }
    
    /// 判断是否新版本
//    private var isNewVersion: Bool {
//
//        // 1.当前版本 -info.plist
//        let currentVersion = Bundle.main.infoDictionary!["CFBundleShortVersionString"] as! String
//        print("当前版本：\(currentVersion)")
//        let version = Double(currentVersion)
//        // 2.之前版本，把之前版本保存在用户偏好
//        let sandboxVersionKey = "sandboxVersionKey"
//        let sandboxVersion = UserDefaults.standard.double(forKey: sandboxVersionKey)
//        print("之前版本：\(sandboxVersion)")
//
//        // 3.保存当前版本
//        UserDefaults.standard.set(version, forKey: sandboxVersionKey)
//
//        return version > sandboxVersion
//    }
}
